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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/40926
Title: 
Comparative study of ovule and fruit development in species of Hypolytrum and Rhynchospora (Cyperaceae, Poales)
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal de Pernambuco (UFPE)
ISSN: 
0378-2697
Abstract: 
The development of the ovule and of the fruit of Hypolytrum bullatum and H. schraderianum (Mapanioideae) and of Rhynchospora consanguinea and R. rugosa (Cyperoideae) are described. All species share anatropous, bitegmic and crassinucellate ovules, funicular obturator, megagametophyte of the Polygonum type, presence of starch grains in the mature megagametophyte, free-nuclear endosperm, Onagrad-type embryogeny, testal-tegmic seed, and a simple fruit of the achene type. Rhynchospora species have characters typical of the family: micropyle formed by the inner integument alone; 3-4-layered parietal tissue; and hard achene. Hypolytrum species differ in those characters by presenting a slightly zigzag micropyle formed by both integuments connected with the funicular obturator, 5-8-layered parietal tissue, and fibrous-spongy achene. The peculiar formation of the micropyle in Hypolytrum is a feature reported here for the first time in the family. The ontogeny provides evidence for a better understanding of the dispersal unit in Hypolytrum supporting the classification as a true achene, like that of Rhynchospora, which is characteristic of the family.
Issue Date: 
1-May-2008
Citation: 
Plant Systematics and Evolution. Wien: Springer Wien, v. 272, n. 1-4, p. 181-195, 2008.
Time Duration: 
181-195
Publisher: 
Springer Wien
Keywords: 
  • micropyle
  • funicular obturator
  • megagametogenesis
  • achene
  • Hypolytrum bullatum
  • Hypolytrum schraderianum
  • Rhynchospora consanguinea
  • Rhynchospora rugosa
Source: 
http://dx.doi.org/10.1007/s00606-007-0636-9
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/40926
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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